2005

5.2

2016

6.2

2005

5.9

2000

7.2

1988

7.0

1993

6.6

1997

6.1

1982

5.4

1991

6.9

2009

5.4

2006

6.5

2012

4.7

2011

7.1

2006

7.0

2006

5.7

2018

6.1

2008

5.2

1994

5.3

2001

6.8

1999

4.1